code: def tearDownClass(cls) -> None:
      ray.shutdown()
  
file_path: ray/python/ray/rllib/algorithms/impala/tests/test_impala_off_policyness.py
imports: import unittest
  import ray
  import ray.rllib.algorithms.impala
  from ray.rllib.utils.framework import try_import_tf
  from ray.rllib.utils.test_utils import check_compute_single_action, framework_iterator
label_desc: Use image node_id 2 for calling the TestIMPALAOffPolicyNess obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types